Stars
A group of stars that form a pattern in the sky
What is a constellation?
A collection of stars, dust, and gas bound together by gravity
Galaxy
The brightness of a star
What is magnitude?
A large cloud of dust and gas in space
Nebulas
The galaxy containing our solar system
What is the Milky Way?
The brightness of a star as seen from Earth
What is apparent magnitude?
All of space and everything in it
What is the universe?
A region of space having a gravitational field so intense that no matter or radiation can escape.
What is a black hole?
What causes a black hole?
What is the collapse of a giant star?
The actual brightness of a star, luminosity
What is absolute magnitude?
The true brightness of an object,another name for absolute magnitude
What is luminosity?
___________________________ are what remains after a red giant star loses it outer layers; small, hot, and extremely dense core left after a red giant explodes
white dwarf
This type of star is formed from a protostar, about 90% of the stars, including the sun, they fuse hydrogen into helium as their fuel source
What is a main sequence star?
One light year equals
9 trillion kilometers
The three main types of galaxies
What is are spiral, irregular and elliptical galaxies?
A huge stellar explosion that is extremely bright but fades over several weeks or months
Supernova
For measuring distances even greater light-years, scientists use
What is a parsec